References

ACPD

Atmospheric Chemistry and Physics Discussions

ACPD

1680-7375

Copernicus GmbH

Göttingen, Germany

10.5194/acpd-11-27661-2011

Aerosol chemical composition at Cabauw, the Netherlands as observed in two intensive periods in May 2008 and March 2009

Mensah

A. A.

¹ ⁵ Holzinger

² Otjes

³ Trimborn

¹ Mentel

T. F.

¹ ten Brink

³ Henzing

⁴ Kiendler-Scharr

Institut für Energie- und Klimaforschung: Troposphäre (IEK 8), Forschungszentrum Jülich GmbH, Jülich, Germany

Institute for Marine and Atmospheric research Utrecht (IMAU), Utrecht, The Netherlands

Energy research Centre of the Netherlands (ECN), Petten, The Netherlands

Netherlands Organisation for Applied Scientific Research (TNO), Utrecht, The Netherlands

now at: Institute of Atmospheric and Climate Science (IAC), ETH Zurich, Zurich, Switzerland

12 10 2011

11 10 27661 27699

This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

This article is available from http://www.atmos-chem-phys-discuss.net/11/27661/2011/acpd-11-27661-2011.html

The full text article is available as a PDF file from http://www.atmos-chem-phys-discuss.net/11/27661/2011/acpd-11-27661-2011.pdf

Observations of aerosol chemical composition in Cabauw, the Netherlands, are presented for two intensive measurement periods in May 2008 and March 2009. Sub-micron aerosol chemical composition was measured by an Aerodyne Aerosol Mass Spectrometer (AMS) and is compared to observations from aerosol size distribution measurements as well as composition measurements with a Monitor for AeRosol and GAses (MARGA) based instrument and a Thermal-desorption Proton-transfer-reaction Mass-spectrometer (TD-PTR-MS). An overview of the data is presented and the data quality is discussed. In May 2008 enhanced pollution was observed with organics contributing 40% to the PM1 mass. In contrast the observed average mass loading was lower in March 2009 and a dominance of ammonium nitrate (42%) was observed. The semi-volatile nature of ammonium nitrate is evidenced in the diurnal cycles with maximum concentrations observed in the morning hours in May 2008 and little diurnal variation observed in March 2009. Size dependent composition data from AMS measurements are presented and show a dominance of organics in the size range below 200 nm.

References 1

Aiken,~A C., Salcedo,~D., Cubison,~M J., Huffman,~J A., DeCarlo,~P F., Ulbrich,~I M., Docherty,~K S., Sueper,~D., Kimmel,~J R., Worsnop,~D R., Trimborn,~A., Northway,~M., Stone,~E A., Schauer,~J J., Volkamer,~R M., Fortner,~E., de Foy,~B., Wang,~J., Laskin,~A., Shutthanandan,~V., Zheng,~J., Zhang,~R., Gaffney,~J., Marley,~N A., Paredes-Miranda,~G., Arnott,~W P., Molina,~L T., Sosa,~G., and Jimenez,~J L.: Mexico City aerosol analysis during MILAGRO using high resolution aerosol mass spectrometry at the urban supersite (T0) – Part 1: Fine particle composition and organic source apportionment, Atmos. Chem. Phys., 9, 6633–6653, http://dx.doi.org/10.5194/acp-9-6633-2009doi:10.5194/acp-9-6633-2009, 2009. %%ok

ten Brink,~H., Kruisz,~C., Kos,~G P A., and Berner,~A.: Composition/size of the light-scattering aerosol in the Netherlands, Atmos. Environ., 31, 3955–3962, 1997.

ten Brink,~H., Otjes,~R., Jongejan,~P., and Slanina,~S.: An instrument for semi-continuous monitoring of the size-distribution of nitrate, ammonium, sulphate and chloride in aerosol, Atmos. Environ., 41, 2768–2779, 2007.

ten Brink,~H., Otjes,~R., Jongejan,~P., and Kos,~G.: Monitoring of the ratio of nitrate to sulphate~in~size-segregated submicron aerosol in the Netherlands, Atmos. Res, 92, 270–276, 2009.

Canagaratna,~M R., Jayne,~J T., Jimenez, J. L., Allan, J. D., Alfarra, M. R., Zhang,~Q., Onasch,~T B., Drewnick,~F., Coe,~H., Middlebrook,~A., Delia,~A., Williams, ~L R., Trimborn,~A M., Northway,~M J., DeCarlo,~P F., Kolb,~C E., Davidovits,~P., and Worsnop,~D R.: Chemical and microphysical characterization of ambient aerosols with the aerodyne aerosol mass spectrometer, Mass Spectrom. Rev., 26, 185–222, 2007.

Crosier,~J., Allan,~J D., Coe,~H., Bower,~K N., Formenti,~P., and Williams,~P I.: Chemical composition of summertime aerosol in the Po Valley (Italy), Northern Adriatic and Black Sea,~Q J. Roy. Meteor. Soc., 133, 61–75, 2007.

DeCarlo,~P F., Kimmel,~J R., Trimborn,~A., Northway,~M J., Jayne,~J T., Aiken,~A C., Gonin,~M., Fuhrer,~K., Horvath,~T., Docherty,~K S., Worsnop, ~D R., and Jimenez,~J L.: Field-deployable, high-resolution, time-of-flight aerosol mass spectrometer, Anal. Chem., 78, 8281–8289, 2006.

Dentener,~F J. and Crutzen,~P J.: Reaction of N2O$_5$ on tropospheric aerosols: impact on the global distributions of \chemNO_x, O3, and OH,~J. Geophys. Res., 98, 7149–7163, http://dx.doi.org/10.1029/92jd02979doi:10.1029/92jd02979, 1993.

Drewnick,~F., Schwab,~J J., Jayne,~J T., Canagaratna,~M., Worsnop,~D R., and Demerjian,~K L.: Measurement of ambient aerosol composition during the PMTACS-NY 2001 using an aerosol mass spectrometer. Part I: Mass concentrations, Aerosol Sci. Tech., 38, 92–103, 2004.

Hallquist,~M., Wenger,~J C., Baltensperger,~U., Rudich,~Y., Simpson,~D., Claeys,~M., Dommen,~J., Donahue,~N M., George,~C., Goldstein,~A H., Hamilton,~J F., Herrmann,~H., Hoffmann,~T., Iinuma,~Y., Jang,~M., Jenkin,~M E., Jimenez,~J L., Kiendler-Scharr,~A., Maenhaut,~W., McFiggans,~G., Mentel,~Th F., Monod,~A., Prévôt,~A S H., Seinfeld,~J H., Surratt,~J D., Szmigielski,~R., and Wildt,~J.: The formation, properties and impact of secondary organic aerosol: current and emerging issues, Atmos. Chem. Phys., 9, 5155–5236, http://dx.doi.org/10.5194/acp-9-5155-2009doi:10.5194/acp-9-5155-2009, 2009. %%ok

Hamburger,~T., McMeeking,~G., Minikin,~A., Birmili,~W., Dall'Osto,~M., O'Dowd,~C., Flentje,~H., Henzing,~B., Junninen,~H., Kristensson,~A., de Leeuw,~G., Stohl,~A., Burkhart,~J F., Coe,~H., Krejci,~R., and Petzold,~A.: Overview of the synoptic and pollution situation over Europe during the EUCAARI-LONGREX field campaign, Atmos. Chem. Phys., 11, 1065–1082, http://dx.doi.org/10.5194/acp-11-1065-2011doi:10.5194/acp-11-1065-2011, 2011. %%ok

Hansel,~A., Jordan,~A., Holzinger,~R., Prazeller,~P., Vogel,~W., and Lindinger,~W.: Proton-transfer reaction mass-spectrometry – online trace gas-analysis at the Ppb level, Int J. Mass Spectrom., 150, 609–619, 1995.

Holzinger,~R., Kasper-Giebl,~A., Staudinger,~M., Schauer,~G., and Röckmann,~T.: Analysis of the chemical composition of organic aerosol at the Mt. Sonnblick observatory using a novel high mass resolution thermal-desorption proton-transfer-reaction mass-spectrometer (hr-TD-PTR-MS), Atmos. Chem. Phys., 10, 10111–10128, http://dx.doi.org/10.5194/acp-10-10111-2010doi:10.5194/acp-10-10111-2010, 2010a. %%ok

Holzinger,~R., Williams,~J., Herrmann,~F., Lelieveld,~J., Donahue,~N M., and Röckmann,~T.: Aerosol analysis using a Thermal-Desorption Proton-Transfer-Reaction Mass Spectrometer (TD-PTR-MS): a new approach to study processing of organic aerosols, Atmos. Chem. Phys., 10, 2257–2267, http://dx.doi.org/10.5194/acp-10-2257-2010doi:10.5194/acp-10-2257-2010, 2010b. %%ok

Huffman,~J A., Jayne,~J T., Drewnick,~F., Aiken,~A C., Onasch,~T., Worsnop,~D R., and Jimenez,~J L.: Design, modeling, optimization, and experimental tests of a~particle beam width probe for the aerodyne aerosol mass spectrometer, Aerosol Sci. Tech., 39, 1143–1163, 2005.

IPCC: Intergovernmental Panel on Climate Change: Climate Change 2007: The Physical Science Basis, Cambrige University Press, 2007.

Jayne,~J T., Leard,~D C., Zhang,~X F., Davidovits,~P., Smith,~K A., Kolb,~C E., and Worsnop,~D R.: Development of an aerosol mass spectrometer for size and composition analysis of submicron particles, Aerosol Sci. Tech., 33, 49–70, 2000.

Jimenez,~J L., Jayne,~J T., Shi,~Q., Kolb,~C E., Worsnop,~D R., Yourshaw,~I., Seinfeld,~J H., Flagan,~R C., Zhang,~X F., Smith,~K A., Morris,~J W., and Davidovits,~P.: Ambient aerosol sampling using the aerodyne aerosol mass spectrometer,~J. Geophys. Res.-Atmos., 108, 8425, http://dx.doi.org/10.1029/2001JD001213doi:10.1029/2001JD001213, 2003.

Jimenez,~J L., Canagaratna,~M R., Donahue,~N M., Prevot,~A S H., Zhang,~Q., Kroll,~J H., DeCarlo,~P F., Allan,~J D., Coe,~H., Ng,~N L., Aiken,~A C., Docherty,~K S., Ulbrich,~I M., Grieshop,~A P., Robinson,~A L., Duplissy,~J., Smith,~J D., Wilson,~K R., Lanz,~V A., Hueglin,~C., Sun,~Y. ~L., Tian,~J., Laaksonen,~A., Raatikainen,~T., Rautiainen,~J., Vaattovaara,~P., Ehn,~M., Kulmala,~M., Tomlinson,~J M., Collins,~D R., Cubison,~M J.,~E., Dunlea,~J., Huffman,~J A., Onasch,~T B., Alfarra,~M R., Williams,~P. ~I., Bower,~K., Kondo,~Y., Schneider,~J., Drewnick,~F., Borrmann,~S., Weimer, ~S., Demerjian,~K., Salcedo,~D., Cottrell,~L., Griffin,~R., Takami,~A., Miyoshi,~T., Hatakeyama,~S., Shimono,~A., Sun,~J Y., Zhang,~Y M., Dzepina, ~K., Kimmel,~J R., Sueper,~D., Jayne,~J T., Herndon,~S C., Trimborn,~A. ~M., Williams,~L R., Wood,~E C., Middlebrook,~A M., Kolb,~C E., Baltensperger,~U., and Worsnop,~D R.: Evolution of organic aerosols in the atmosphere, Science, 326, 1525–1529, http://dx.doi.org/10.1126/science.1180353doi:10.1126/science.1180353, 2009.

Kulmala,~M., Asmi,~A., Lappalainen,~H K., Carslaw,~K S., Pöschl,~U., Baltensperger,~U., Hov, Ø., Brenquier,~J.-L., Pandis,~S N., Facchini,~M C., Hansson,~H.-C., Wiedensohler,~A., and O'Dowd,~C D.: Introduction: European Integrated Project on Aerosol Cloud Climate and Air Quality interactions (EUCAARI) – integrating aerosol research from nano to global scales, Atmos. Chem. Phys., 9, 2825–2841, http://dx.doi.org/10.5194/acp-9-2825-2009doi:10.5194/acp-9-2825-2009, 2009. %%ok

Kulmala,~M., Asmi,~A., Lappalainen,~H K., Baltensperger,~U., Brenguier,~J.-L., Facchini,~M C., Hansson,~H.-C., Hov, Ø., O'Dowd,~C D., Pöschl,~U., Wiedensohler,~A., Boers,~R., Boucher,~O., de Leeuw,~G., Denier van den Gon,~H., Feichter,~J., Krejci,~R., Laj,~P., Lihavainen,~H., Lohmann,~U., McFiggans,~G., Mentel,~T., Pilinis,~C., Riipinen,~I., Schulz,~M., Stohl,~A., Swietlicki,~E., Vignati,~E., Amann,~M., Amann,~M., Alves,~C., Arabas,~S., Artaxo,~P., Beddows,~D C S., Bergström,~R., Beukes,~J P., Bilde,~M., Burkhart,~J F., Canonaco,~F., Clegg,~S., Coe,~H., Crumeyrolle,~S., D'Anna,~B., Decesari,~S., Gilardoni,~S., Fischer,~M., Fjæraa,~A M., Fountoukis,~C., George,~C., Gomes,~L., Halloran,~P., Hamburger,~T., Harrison,~R M., Herrmann,~H., Hoffmann,~T., Hoose,~C., Hu,~M., H�rrak,~U., Iinuma,~Y., Iversen,~T., Josipovic,~M., Kanakidou,~M., Kiendler-Scharr,~A., Kirkevåg,~A., Kiss,~G., Klimont,~Z., Kolmonen,~P., Komppula,~M., Kristjánsson,~J.-E., Laakso,~L., Laaksonen,~A., Labonnote,~L., Lanz,~V A., Lehtinen,~K E J., Makkonen,~R., McMeeking,~G., Merikanto,~J., Minikin,~A., Mirme,~S., Morgan,~W T., Nemitz,~E., O'Donnell,~D., Panwar,~T S., Pawlowska,~H., Petzold,~A., Pienaar,~J J., Pio,~C., Plass-Duelmer,~C., Prévôt,~A S H., Pryor,~S., Reddington,~C L., Roberts,~G., Rosenfeld,~D., Schwarz,~J., Seland, Ø., Sellegri,~K., Shen,~X J., Shiraiwa,~M., Siebert,~H., Sierau,~B., Simpson,~D., Sun,~J Y., Topping,~D., Tunved,~P., Vaattovaara,~P., Vakkari,~V., Veefkind,~J P., Visschedijk,~A., Vuollekoski,~H., Vuolo,~R., Wehner,~B., Wildt,~J., Woodward,~S., Worsnop,~D R., van Zadelhoff,~G.-J., Zardini,~A A., Zhang,~K., van Zyl,~P G., Kerminen,~V.-M.,~S. Carslaw,~K., and Pandis,~S N.: General overview: European Integrated project on Aerosol Cloud Climate and Air Quality interactions (EUCAARI) – integrating aerosol research from nano to global scales, Atmos. Chem. Phys. Discuss., 11, 17941–18160, http://dx.doi.org/10.5194/acpd-11-17941-2011doi:10.5194/acpd-11-17941-2011, 2011. %%ok

Lindinger,~W., Hansel,~A., and Jordan,~A.: Proton-transfer-reaction mass spectrometry (PTR-MS): on-line monitoring of volatile organic compounds at pptv levels, Chem. Soc. Rev., 27, 347–354, 1998.

Liu,~P., Ziemann,~P J., Kittelson,~D B., and McMurry,~P H.: Generating particle beams of controlled dimensions and divergence:~I. Theory of particle motion in aerodynamic lenses and nozzle expansions, Aerosol Sci. Tech., 22, 293–313, 1995a.

Liu,~P., Ziemann,~P J., Kittelson,~D B., and McMurry,~P H.: Generating particle beams of controlled dimensions and divergence: II. Experimental evaluation of particle motion in aerodynamic lenses and nozzle expansions, Aerosol Sci. Tech., 22, 314–324, 1995b.

Matthew,~B M., Middlebrook,~A M., and Onasch,~T B.: Collection efficiencies in an aerodyne aerosol mass spectrometer as a~function of particle phase for laboratory generated aerosols, Aerosol Sci. Tech., 42, 884–898, 2008.

Mensah,~A A., Buchholz,~A., Mentel,~T F., Tillmann,~R., and Kiendler-Scharr,~A.: Aerosol mass spectrometric measurements of stable crystal hydrates of oxalates and inferred relative ionization efficiency of water,~J. Aerosol Sci., 42, 11–19, http://dx.doi.org/10.1016/j.jaerosci.2010.10.003doi:10.1016/j.jaerosci.2010.10.003, 2011.

Monks,~P S., Granier,~C., Fuzzi,~S., Stohl,~A., Williams,~M L., Akimoto,~H., Amann,~M., Baklanov,~A., Baltensperger,~U., Bey,~I., Blake,~N., Blake,~R S., Carslaw,~K., Cooper,~O R., Dentener,~F., Fowler,~D., Fragkou,~E., Frost,~G J., Generoso,~S., Ginoux,~P., Grewe,~V., Guenther,~A., Hansson,~H C., Henne,~S., Hjorth,~J., Hofzumahaus,~A., Huntrieser,~H., Isaksen,~I S A., Jenkin,~M E., Kaiser,~J., Kanakidou,~M., Klimont,~Z., Kulmala,~M., Laj,~P., Lawrence,~M G., Lee,~J D., Liousse,~C., Maione,~M., McFiggans,~G., Metzger,~A., Mieville,~A., Moussiopoulos,~N., Orlando,~J J., O'Dowd,~C D., Palmer,~P I., Parrish,~D D., Petzold,~A., Platt,~U., Pöschl,~U., Prévôt,~A S H., Reeves,~C E., Reimann,~S., Rudich,~Y., Sellegri,~K., Steinbrecher,~R., Simpson,~D., ten Brink,~H., Theloke,~J., van der Werf,~G R., Vautard,~R., Vestreng,~V., Vlachokostas,~C., and von Glasow,~R.: Atmospheric composition change – global and regional air quality, Atmos. Environ., 43, 5268–5350, http://dx.doi.org/10.1016/j.atmosenv.2009.08.021doi:10.1016/j.atmosenv.2009.08.021, 2009.

Moolgavkar,~S H.: Air Pollution and Mortality, New Engl J. Med., 330, 1237–1238, 1994.

Morgan,~W T., Allan,~J D., Bower,~K N., Esselborn,~M., Harris,~B., Henzing,~J S., Highwood,~E J., Kiendler-Scharr,~A., McMeeking,~G R., Mensah,~A A., Northway,~M J., Osborne,~S., Williams,~P I., Krejci,~R., and Coe,~H.: Enhancement of the aerosol direct radiative effect by semi-volatile aerosol components: airborne measurements in North-Western Europe, Atmos. Chem. Phys., 10, 8151–8171, http://dx.doi.org/10.5194/acp-10-8151-2010doi:10.5194/acp-10-8151-2010, 2010a. %%ok

Morgan,~W T., Allan,~J D., Bower,~K N., Highwood,~E J., Liu,~D., McMeeking,~G R., Northway,~M J., Williams,~P I., Krejci,~R., and Coe,~H.: Airborne measurements of the spatial distribution of aerosol chemical composition across Europe and evolution of the organic fraction, Atmos. Chem. Phys., 10, 4065–4083, http://dx.doi.org/10.5194/acp-10-4065-2010doi:10.5194/acp-10-4065-2010, 2010b. %ok

Nazarenko,~L. and Menon,~S.: Varying trends in surface energy fluxes and associated climate between 1960 and 2002 based on transient climate simulations, Geophys. Res. Lett., 32, L22704, http://dx.doi.org/10.1029/2005GL024089doi:10.1029/2005GL024089, 2005.

Nober,~F J., Graf,~H.-F., and Rosenfeld,~D.: Sensitivity of the global circulation to the suppression of precipitation by anthropogenic aerosols, Global Planet. Change, 37, 57–80, 2003.

Norris,~J R. and Wild,~M.: Trends in aerosol radiative effects over Europe inferred from observed cloud cover, solar \qutdimming and solar \qutbrightening, J. Geophys. Res., 112, D08214, http://dx.doi.org/10.1029/2006JD007794doi:10.1029/2006JD007794, 2007.

Phillips,~V T J., Choularton,~T W., Blyth,~A M., and Latham,~J.: The influence of aerosol concentrations on the glaciation and precipitation of a~cumulus cloud,~Q J. Roy. Meteor. Soc., 128, 951–971, 2002.

Pope,~C A., Burnett,~R T., Thun,~M J., Calle,~E E., Krewski,~D., Ito,~K., and Thurston,~G D.: Lung cancer, cardiopulmonary mortality, and long-term exposure to fine particulate air pollution,~J. Amer. Med. Assoc., 287, 1132–1141, http://dx.doi.org/10.1001/jama.287.9.1132doi:10.1001/jama.287.9.1132, 2002.

Putaud,~J.-P., Raes,~F., Van Dingenen,~R., Brüggemann,~E., Facchini,~M C., Decesari,~S., Fuzzi,~S., Gehrig,~R., Hüglin,~C., Laj,~P., Lorbeer,~G., Maenhaut,~W., Mihalopoulos,~N., Müller,~K., Querol,~X., Rodriguez,~S., Schneider,~J., Spindler,~G., ten Brink,~H., Tørseth,~K., and Wiedensohler,~A.: A~European aerosol phenomenology – 2: Chemical characteristics of particulate matter at kerbside, urban, rural and background sites in Europe, Atmos. Environ., 38, 2579–2595, http://dx.doi.org/10.1016/j.atmosenv.2004.01.041doi:10.1016/j.atmosenv.2004.01.041, 2004.

Ramanathan,~V., Li,~F., Ramana,~M V., Praveen,~P S., Kim,~D., Corrigan,~C E., Nguyen,~H., Stone,~E A., Schauer,~J J., Carmichael,~G R., Adhikary,~B., and Yoon,~S C.: Atmospheric brown clouds: hemispherical and regional variations in long-range transport, absorption, and radiative forcing, J. Geophys. Res., 112, D22S21, http://dx.doi.org/10.1029/2006JD008124doi:10.1029/2006JD008124, 2007.

Roelofs,~G.-J., ten Brink,~H., Kiendler-Scharr,~A., de Leeuw,~G., Mensah,~A., Minikin,~A., and Otjes,~R.: Evaluation of simulated aerosol properties with the aerosol-climate model ECHAM5-HAM using observations from the IMPACT field campaign, Atmos. Chem. Phys., 10, 7709–7722, http://dx.doi.org/10.5194/acp-10-7709-2010doi:10.5194/acp-10-7709-2010, 2010. %%ok

Rogge,~W F., Mazurek,~M A., Hildemann,~L M., Cass,~G R., and Simoneit, ~B R T.: Quantification of urban organic aerosols at a~molecular level: identification, abundance and seasonal variation, Atmos. Environ. A-Gen., 27, 1309–1330, 1993.

Romanou,~A., Liepert,~B., Schmidt,~G A., Rossow,~W B., Ruedy,~R A., and Zhang,~Y.: 20th century changes in surface solar irradiance in simulations and observations, Geophys. Res. Lett., 34, L05713, http://dx.doi.org/10.1029/2006GL028356doi:10.1029/2006GL028356, 2007.

Rotz,~C A.: Management to reduce nitrogen losses in animal production,~J. Anim. Sci., 82, E119–137, 2004.

Russchenberg,~H., Bosveld,~F., Swart,~D., ten Brink,~H., de Leeuw,~G., Uijlenhoet,~R., Arbesser-Rastburg,~B., van der Marel,~H., Ligthart,~L., Boers,~R., and Apituley,~A.: Ground-Based Atmospheric Remote Sensing in the Netherlands: European Outlook, The Institute of Electronics, Information and Communication Engineers, E88–B, IEICE Transactions on communications, http://dx.doi.org/10.1093/ietcom/e88-b.6.2252doi:10.1093/ietcom/e88-b.6.2252, 2005.

Schaap,~M., Otjes,~R P., and Weijers,~E P.: Illustrating the benefit of using hourly monitoring data on secondary inorganic aerosol and its precursors for model evaluation, Atmos. Chem. Phys. Discuss., 10, 12341–12370, http://dx.doi.org/10.5194/acpd-10-12341-2010doi:10.5194/acpd-10-12341-2010, 2010. %%ok

Slanina,~J., ten Brink,~H M., Otjes,~R P., Even,~A., Jongejan,~P., Khlystov,~A., Waijers-Ijpelaan,~A., Hu,~M., and Lu,~Y.: The continuous analysis of nitrate and ammonium in aerosols by the steam jet aerosol collector (SJAC): extension and validation of the methodology, Atmos. Environ., 35, 2319–2330, 2001.

Tao,~W K., Li,~X W., Khain,~A., Matsui,~T., Lang,~S., and Simpson,~J.: Role of atmospheric aerosol concentration on deep convective precipitation: cloud-resolving model simulations,~J. Geophys. Res., 112, D24S18, http://dx.doi.org/10.1029/2007JD008728doi:10.1029/2007JD008728, 2007.

Trebs,~I., Meixner,~F X., Slanina,~J., Otjes,~R., Jongejan,~P., and Andreae,~M O.: Real-time measurements of ammonia, acidic trace gases and water-soluble inorganic aerosol species at a rural site in the Amazon Basin, Atmos. Chem. Phys., 4, 967–987, http://dx.doi.org/10.5194/acp-4-967-2004doi:10.5194/acp-4-967-2004, 2004. %%ok

Williams,~B J., Goldstein,~A H., Kreisberg,~N M., and Hering,~S V.: An in-situ instrument for speciated organic composition of atmospheric aerosols: \underline Thermal Desorption \underline Aerosol \underline GC/MS-FID (TAG), Aerosol Sci. Tech., 40, 627–638, 2006.

Zhang,~Q., Jimenez,~J L., Canagaratna,~M R., Allan,~J D., Coe,~H., Ulbrich,~I., Alfarra,~M R., Takami,~A., Middlebrook,~A M., Sun,~Y L., Dzepina,~K., Dunlea,~E., Docherty,~K., DeCarlo,~P F., Salcedo,~D., Onasch,~T., Jayne,~J T., Miyoshi,~T., Shimono,~A., Hatakeyama,~S., Takegawa,~N., Kondo,~Y., Schneider,~J., Drewnick,~F., Borrmann,~S., Weimer,~S., Demerjian,~K., Williams,~P., Bower,~K., Bahreini,~R., Cottrell,~L., Griffin,~R J., Rautiainen,~J., Sun,~J Y., Zhang,~Y M., and Worsnop,~D R.: Ubiquity and dominance of oxygenated species in organic aerosols in anthropogenically-influenced Northern Hemisphere midlatitudes, Geophys. Res. Lett., 34, L13801, http://dx.doi.org/10.1029/2007GL029979doi:10.1029/2007GL029979, 2007.

Zhang,~X., Smith,~K A., Worsnop,~D R., Jimenez,~J L., Jayne,~J T., Kolb,~C E., Morris,~J., and Davidovits,~P.: Numerical characterization of particle beam collimation – Part II: Integrated Aerodynamic-Lens-Nozzle System, Aerosol Sci. Tech., 38, 619–638, 2004.